JPS5934973Y2 - solenoid - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a solenoid having a pair of movable iron cores that simultaneously move in opposite directions.

Conventionally, in order to obtain linear driving force in opposite directions at the same time, it is necessary to use two solenoids having substantially the same performance.

However, this had the disadvantage that it was not only large in size but also expensive.

This idea was made to eliminate the above-mentioned drawbacks.
It is an object of the present invention to provide a small and inexpensive solenoid that can simultaneously drive a pair of movable iron cores in opposite directions.

An embodiment of this invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a cylindrical bobbin around which an excitation coil 2 is wound, and a groove 11 is formed along the inner circumferential surface of the bobbin 1 in the middle of the hollow portion thereof.

A pair of annular magnetic bodies 3 and 4 are accommodated in this groove 11 separated by a predetermined distance.

In this case, the magnetic bodies 3 and 4 are arranged symmetrically with respect to the axial midpoint of the bobbin 1.

A non-magnetic pipe 5 is inserted into the hollow part of the bobbin 1.

On the other hand, a frame 6 is provided to surround the excitation coil 2.

This frame 6 has holes 6L62 communicating with both open ends of the bobbin 1.

A pair of movable iron cores 7 and 8 are inserted through these holes 61 and 62 from both open ends of the bobbin 1 so as to be able to approach and separate.

In this case, a biasing force is applied to each of the movable cores 7 and 8 in the direction of separation.

In addition, 91 and 92 in the figure are stoppers for the movable cores 7 and 8.

Next, the operation of the solenoid constructed as above will be described.

Assume that the movable cores 7 and 8 are separated from each other as shown in FIG. 1, and when the excitation coil 2 is energized from this state, a magnetic flux is generated in the direction of the arrow in the figure.

In this case, since the magnetic bodies 3 and 4 are interposed between the movable cores 7 and 8, most of the magnetic flux is transmitted through these magnetic bodies 3 and 4.

As a result, attractive forces act between the movable iron core 7 and the magnetic body 3 and between the movable iron core 8 and the magnetic body 4, and the movable iron core 8 and the magnetic body 4 are moved in opposite directions, that is, inward of the bobbin 1.

When the tips of the movable cores 7 and 8 approach each other, most of the magnetic flux passes directly between the movable cores 7 and 8, and as a result, the space between the movable cores 7 and 80 is further attracted, as shown in FIG. It is adsorbed.

In this case, during the moving process, the movable cores 7 and 8 are first attracted to the magnetic bodies 3 and 4, and then directly attracted between the movable cores 7 and 8, so the relationship between the attraction force and the stroke is relatively flat. become.

Thereafter, when the excitation coil 2 is released, the movable cores γ8 are separated by the biasing force in the separation direction and returned to the original state shown in FIG.

Therefore, with this configuration, it is possible to linearly drive a pair of movable iron cores in opposite directions at the same time, so it is smaller than the conventional method of using two solenoids with approximately the same performance.
Moreover, it can be done at a low price.

It should be noted that this invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications without changing the gist.

For example, as shown in FIG. 3 in which the same parts as in FIG. It may also be used as a stopper during operation of the movable cores 7 and 8.

In this way, the tips of the movable cores 7 and 8 can be received by the projecting wall 111 with a slight gap in between, thereby preventing noise generation when the movable cores 7 and 8 are attracted.

Further, although annular magnetic bodies 3 and 4 are used in the above description, magnetic bodies other than annular ones can also be used.

As described above, according to this invention, a pair of movable iron cores can be simultaneously driven in opposite directions, and a small and inexpensive solenoid can be provided.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of this invention.
The figure shows a non-operating state, FIG. 2 is a longitudinal cross-sectional view showing an operating state, and FIG. 3 is a longitudinal cross-sectional view showing another embodiment of this invention. 1... Bobbin, 11... Groove, 111... Projection wall,
2... Excitation coil, 3, 4... Magnetic material, 5... Pipe, 6... Frame, 61, 62... Hole, T, 8
...Movable iron core, 91.92...Stopper.

Claims (2)

[Scope of utility model registration request] (1) A bobbin that is cylindrical and has a groove formed along the inner circumferential surface in the axially intermediate portion of the hollow part, an excitation coil wound around this bobbin, and an excitation coil that is housed in the groove of the bobbin. It is characterized by comprising a pair of magnetic bodies disposed at symmetrical positions with respect to an axial midpoint of the bobbin, and a pair of movable iron cores movably inserted through both open ends of the bobbin. Solenoid. (2) The bobbin is characterized in that a protruding wall is formed in the groove portion to partition between the pair of magnetic bodies, and the protruding wall is used as a stopper for the movable iron core. Solenoid.